> If a = b, then: > a^2 = a*b > a^2 - b^2 = (a*b) - b^2 > (a-b)(a+b) = b(a - b) > (a+b) = b > Substitute the original a = b into the equation: > 2b = b > 2 = 1 http://members.cox.net/mathmistakes/ -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads